This SAE Parts Standard provides dimensional and quality assurance requirements for 1/4 through 2 in sizes of studs in the following configurations in standard materials used for ship system applications: a. Continuous thread studs in UNRC and 8UNR series. b. Double end studs (clamping type) where both ends are of the same thread series (UNRC or 8UN). Also called bolt-studs. (These are suitable for mating with nuts or the set end may be installed with anaerobic thread locking compound.) c. Double end studs (interference thread type) with the nut end having UNRC or 8UNR series thread and where the tap end has NC 5 HFS interference fit thread forms. Also called a tap end stud. A complete metric companion to this document is provided in SAE J2271M, therefore no metric equivalents are presented. These studs are primarily or use in ship systems and equipment.
This SAE Recommended Practice is intended to serve as a reference for the amount of torque that a Power Take-Off can induce on the transmission mounting pad. This document will apply to six-bolt, eight-bolt, and rear mounted power take-offs.
This SAE Recommended Practice describes requirements for lamps, reflective devices, and associated equipment for signaling to enable safe operation in darkness and other conditions of reduced visibility.
This SAE Standard provides recommended dimensions for drawbars for crawler tractors as defined in SAE J1057 (SEP88). It includes only those dimensions which will affect the attaching of towed equipment.
This SAE Parts Standard provides dimensional and quality assurance requirements for M6 through M36 metric sizes of studs in the following configurations in materials needed for ship system applications: 1. Continuous thread studs in M thread profile. b. Double end studsclamping type (also called bolt-studs) where both ends are of the same thread series but different lengths (M thread profile). A complete inch companion to this document is provided in SAE J2271. These studs are primarily for use in ship systems and equipment. The continuous thread studs and the constant strength double end studs are configurations particularly suited to applications which are subject to high shock requirements.
Including electrohydraulics As electrohydraulics technologies mature and expand, the cost of incorporating them into equipment continues to decrease. Operating the machine As long as people need to be in a machine to run a machine, operator stations will continue to become more operator-friendly.
Top Technologies of 2009 The editors take a brief look back at the most significant innovations during the past year as voted on by readers. The big picture A holistic approach to hydraulics improves overall vehicle efficiency. Getting smart with electronics More chips, usually with more power and memory, are being deployed throughout off-highway equipment.
Bridging the power gap An alliance between Cummins and Komatsu provides an intriguing prospect to the industrial engine market with the new QSK78 industrial engine. Large eddy simulation in hydraulic valves Cavitation in hydraulic spool valaves involves large-scale vortical structures in an unsteady submerged jet. According to engineers from Purdue University, curent CFD approaches do not accurately predict these unsteady vortices, nor do they properly account for bubble-dynamics/flow-structure interactions. Proving heavy-vehicle performance The Nevada Automotive Test Center and Mechanical Dynamics joined forces to redesign and improve the drivetrain, frame, steering, and other subsystems of a heavy-duty military-vehicle for the USMC. Tying it all together GPS. Engine diagnostics. Wireless communications. So much technology. So many voices. Is it a chorus of the Tower of Babel?
Tying it all together Networks link control modules to bring more features and functions to the job site. Collaboration tools spread a wide net PLM suppliers are offering new tools that aid collaboration, expanding on core offerings in PDM, CAD, and CAE. The drive toward a hybrid transmission In-wheel hydraulic motors, hydraulic transformers, and a common pressure rail with accumulators put new meaning in the word drivetrain. A deep dive into metallurgical failure Even with the best engineering processes and quality planning, deviations can occur with the incoming material, things can go wrong during the manufacturing process, and service conditions can be different than expected. Standards and 'coopetition' In the heavy-duty vehicle arena, adoption of standards for networking benefits everyone.
Making sense of engines Heavy-duty equipment is known for its ruggedness in harsh environments, but vehicles are not neglecting their sensitive side. The world's fastest digger gets closer JCB's Dieselmax goes 350 mph and teaches engineers much about engine capability, extreme testing, and program management. The whole system, and nothing but the system Properly implemented, an electrohydraulic system can add a great deal of automatic control, advanced performance, advanced diagnostics, and remote monitoring to a mobile application. Regenerative hydraulics The use of multiple hydraulic pumps can satisfy the needs of various circuits in off-highway equipment. The gas is greener Biofuels promise to help reduce petroleum cinsumption and CO2 emissions, but much of the potential depends on production and infrastructure investments. Material returns Effective use of materials information is important to engineers in development of parts and components.
Digital revolution changing hydraulics Electrohydraulics trim costs while improving safety and efficiency. Heavy-duty testing Targeting off-highway and other commercial vehicle engine makers, Ricardo has expanded its Chicago Technical Center to help them comply with upcoming emissions regulations. An integrating experience The importance of systems integration will be an overarching theme at a new SAE conference, COMVEC, for the on-and off-highway commercial vehicle industries. Off-highway gets cooler and greener An environmentally benign A/C refrigerant rooftop unit is ready for testing in logging and mining equipment in Australia. Mining for better seating The mining site is a particularly challenging environment for vehicles, which combined with the intense work schedule of most mining operations, leads to a serious need for comfort and convenience for equipment operators.
Lightpipe design According to Breault Research Organization, any off-highway instrument or control that needs illumination is a candidate for a lightpipe to take light from where it is generated to where it is needed. The biodiesel choice Experts from the Natural Biodiesel Board believe it is time to consider alternatives to the current fuel structure. One solution to rising fuel prices is the pursuit of biodiesel fuels. Understanding machining difficulties in gray iron Bosch Braking Systems' engineers look more closely than usual at iron brake rotor samples to give new insights into critical characteristics of the material. Caterpillar mining for customers With commodity prices low, Caterpillar wants to make mining as productive an enterprise as possible for customers.
Engineering a cleaner off-highway world As engine manufacturers gear up to meet the next round of stringent emissions standards, equipment manufacturers are reviewing a number of design possibilities. Plugging in for safety Electronics dig deep to help protect operators and equipment. Leveraging the best of both worlds Combustion and aftertreatment technologies help engine manufacturers balance performance with emissions reduction.